FITTING AS-AIR CONDITIONER 3E4066 - Caterpillar

To prevent possible injury, do not use the starter to turn the flywheel. Hot engine components can cause burns. Allow additional time for the engine to cool before measuring valve clearance.
This engine uses high voltage to control the fuel injectors.Disconnect electronic fuel injector enable circuit connector to prevent personal injury.Do not come in contact with the fuel injector terminals while the engine is running.
Note: Valve lash is measured between the rocker arm and the valve bridge. All measurements and adjustments must be made with the engine stopped and the valves fully closed.Specifications
Table 1
Valve Lash (Engine Stopped)     Inlet Valves     Exhaust Valves    
0.38 0.08 mm
(0.015 0.003 inch)
0.81 0.080 mm
(0.032 0.003 inch)    
TC Compression Stroke     1-2-4     1-3-5    
TC Exhaust Stroke (1)     3-5-6     2-4-6    
Firing Order     1-5-3-6-2-4 (2)    
( 1 ) 360° from TC compression stroke
( 2 ) The No. 1 cylinder is at the front of the engine.An adjustment is not necessary if the measurement of the valve lash is in the acceptable range in Table 1.
Illustration 1 g03324629
Top view of valve mechanism (1) Intake valve locknut (2) Exhaust valve locknut
Table 2
Torque Specifications    
Callout     Torque    
Locknut (1)
Locknut (2)    
30 7 N m (22 5 lb ft)    If the measurement is not within this range, an adjustment is necessary. Refer to "Valve Lash Adjustment" for the proper procedure.Valve Lash Adjustment Procedure
Illustration 2 g01373511
Cylinder and valve location (A) Exhaust valves (B) Inlet valvesUse the following procedure to adjust the valve lash:
Put the No. 1 piston at the top center position on the compression stroke. Refer to Testing and Adjusting, "Finding Top Center Position for No. 1 Piston".
Table 3
TC Compression Stroke    Inlet Valves    Exhaust Valves